Hello Lothar, In addition to just being able to see the widened lines, I use the Histogram to determine optimum focus. I use Envisage with the DSI Pro II and...
Lothar, Your modification to the Lhires is very interesting and I would appreciate hearing how well it works with a fast scope (f/5). As I use my Lhires with a...
Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the spectro-l group. File : /Halpha.jpg ...
spectro-l@yahoogroups...
Nov 16, 2008 9:33 am
5515
Observation of the LBV star P Cygni The german spectroscopic observers of variable stars Bernd Hanisch and Ernst Pollmann of the german organisation BAV (=...
ernst-pollmann@...
Nov 16, 2008 9:44 am
5516
Hi Bernard not really problematic: Only a bigger acromatic lense + holder and a bigger mirror. That's all. If the arrangement proved to be working well our own...
Hello all, I've never noticed such a focus issue when the temperature changes. And I confirm that mechanical flexion is more important than temperature, as far...
François Cochard
francois.cochard@...
Nov 17, 2008 12:43 pm
5518
Hello François, the focus of my Lhires III (Shelyak series) is also varying with temperature. I made the tests in two rooms which were held at constant ...
Hi Peter, It is good to see I am not alone on this. While I am sure your were careful moving from room to room, I did essentially the same in a fixed room. The...
Hello all, I often calculate my instrument response using a spectrum of Vega from the ELODIE archive. Normally this works ok but today I had some problems...
Hi Jeff, The spectrograph was sitting on a tripod. When moving the equipment from room to room, I grasped the tripod without touching the Lhires III. So I'm...
On Mon, 17 Nov 2008 09:25:07 +0100 François Cochard <francois.cochard@...> wrote: Hi ... I noticed that there is also the mirors that are now...
BM
bmauclaire@...
Nov 17, 2008 6:47 pm
5523
On Fri, 14 Nov 2008 23:28:45 -0000 ... Re. Francois, does the glue that fixes the grating is sensible to thermal fluctuations? Benji ~~~~~~~~~~~~~~~~~~~~~/...
BM
bmauclaire@...
Nov 17, 2008 6:51 pm
5524
Hello I remember Christian noticed this and mentioned it during the OHP class. Seems that professionals also has difficulties to compute the instrumental...
Hello all, I have attached a processed image of the spectra of Alpheratz. Can someone tell me what is causing the brightening on the left side of my image? ...
Hello Valerie, I just checked the fits headers and I see the air mass is much higher for the 2006 spectrum (1.00, 1.03, 1.55) Could it be an extinction...
Hi Ron, I cannot open the file. Could you please send it again? About defining the spectral domain in the field, I have made a copy of the Neon spectrum at...
Ron, I have trouble reading your fits file but I suspect the issue may be light entering into the spectrograph. Make sure you operate with no light close to...
is it possible to take a spectro of the moon and detect some kind of water or the pollution stop every thing I red in other group this message group ...
Hi Ron, How do you open the image file? I tried the AIP4WIN software without success. FITS header error number 0. Sincerely, Tom Buchanan ... From: Ron DiIulio...
maybe it is only a Dream from to be able offer some help I am not the best operator or photographer or spectro photographer maybe it is not possible to a...
... Thanks, Olivier! It's really nice to get your email. You are a great help. I am trying hard to get others interested in your spectrographs! Oh yes, my...
Hi Jose, Olivier, and Tom, Thank you for taking time to reply to me. It appears that my FITS file was corrupted. I will shoot another one and post it again. ...
Olivier, Thanks for the answer. I had the same question regarding the 600 l/ mm. I also noticed that the first order and second order are very close. How...
Hello Ron, I have been interested and have been doing photometry for nearly 30 years. Much can be learned about a star system or star from photometry of it....
Olivier, Is this 'aluminium tape' real aluminium or just a silver coloured plastic? If real aluminium, is it difficult to find? I also have a problem with...
Bernard, In the States and Europe its possible to find wide, (about 40mm ) fairly heavy aluminium foil tape with a very sticky (black?) adhesive backing. Comes...
Hello Bernard, I used just plain duct tape cut into 1/4" strips and it works well. It seems to have solved my light leak. I tested it on my bench with a bright...
Ken, Jeff, Thank you both for your replies. I will look for some alu tape but first try some heavy black (less obvious) plastic/duct tape on my Lhires. Bernard...
... Hi Jeff, Tom, Olivier, and Jose, Shooting test shots and adding tape strips did not remove the bright appearance of the left side of my image, however...
Hi Ron, Check the peak pixel ADUs as it looks like you my have exceeded them. With a 32k bit signed integer file any values greater than 32k get a minus sign...
